JPH0223005Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to flexible circuit boards, and in particular, to mounting electronic or electrical components or other components on a circuit pattern as horizontally as possible. The present invention relates to a flexible circuit board suitable for various uses.

``Prior Art'' This type of flexible circuit board, as shown in FIG. 2, 3, 4, etc., and further, a surface covering material 5 such as insulating ink or coverlay film is formed to protect the circuit pattern, and if necessary, adhesive is applied to the back surface of the base member 1. A structure is provided in which a reinforcing member 7 is provided through a layer 6. 8 and 9 indicate mounted parts.

"Problems to be solved by the invention" In such a case, depending on the type of mounted components 8 and 9, high flatness is required for the flexible circuit board, so the circuit patterns 2, 3, and 4 are Even a difference in level between the base member 1 and the base member 1 may sometimes become a problem. That is, as shown in FIG. 2, the component 8 mounted so that one end is placed on the circuit pattern 2 is inclined, and the component 8 is placed and mounted astride between the circuit patterns 3 and 4. The middle part of the part 9 becomes sagging, making it difficult to obtain parallelism. Therefore, in order to prevent such mounted components from tilting, warping, etc., there is a conventional method of inserting a spacer member prepared as a separate component between the flexible circuit board and the component, but this method is not possible. However, depending on the material, thickness, etc. of the spacer member, it may not be possible to completely eliminate tilting, warping, etc. of the component, and in that case, the overall laminated thickness of the flexible circuit board and the component may increase, making it difficult to mount the component. There was a risk that this would cause some inconvenience.

"Means for Solving the Problems" The present invention has been made to solve the above problems, and therefore, according to the present invention, it is possible to form a desired circuit pattern on at least one surface of the base member. In the flexible circuit board, a spacer pattern is provided on the same surface as the circuit pattern in a blank area where the circuit pattern is formed.

"Function" By providing the spacer pattern mixed with the circuit pattern on the base member in this way,
There is no difference in level between the part where the circuit pattern is present and the other parts, thus preventing the occurrence of tilting, warping, etc. of parts arranged on the circuit pattern, and suitably increasing the strength of the flexible circuit board itself. obtain.

"Embodiment" In FIG. 1 showing an embodiment of the present invention, required circuit patterns 2, 3, 4, etc. are formed on one surface of a base member 1 via an adhesive layer in accordance with a conventional method. However, in the present invention, in the blank area on the surface of the circuit pattern 3 on the base member 1, the parts 8 and 9 to be placed are placed adjacent to the circuit pattern 2. , or the spacer pattern 1 is placed between the circuit patterns 3 and 4.
0 and 11 are provided. Such spacer patterns 10 and 11 can be easily formed by leaving the copper foil when forming the circuit pattern 2 etc. from the copper foil by etching, for example. Then, the surface covering material 5 is applied over both the circuit patterns 2, 3, 4, etc. and the spacer patterns 10, 11.

According to the flexible circuit board having the above structure, as shown in the figure, the component 8 is placed so that one end thereof covers the circuit pattern 2.
When mounted, part 8 is spacer pattern 1
0, so it does not tilt, and in the case of component 9, the circuit patterns 3 and 4
In addition to this, the parts 8 and 9 are also supported by other spacer patterns 11, so that the parts 8 and 9 do not incline or hang down as in the conventional case. Furthermore, by providing the spacer patterns 10 and 11, the strength of the entire substrate can be appropriately increased.

"Effects of the Invention" As described above, according to the present invention, the component mounting surface is flattened by the circuit pattern surface and the spacer pattern. When arranged and mounted on a pattern, there is no risk that the components will be tilted or warped, and therefore a predetermined mounting state and operation between these components and the flexible circuit board can be ensured.
Further, it is not necessary to use a spacer as a separate component to prevent inclination and warping as described above, and the provision of a spacer pattern has the advantage that strength is increased.

[Brief explanation of the drawing]

FIG. 1 is a sectional view conceptually showing an embodiment of a flexible circuit board according to the present invention, and FIG. 2 is a sectional view conceptually showing a conventional flexible circuit board. 1: Base member, 2, 3, 4: Circuit pattern,
5: Surface covering material, 6: Adhesive layer, 7: Reinforcing member, 1
0, 11: Spacer pattern.

Claims (1)

[Scope of utility model registration request] A flexible circuit board in which a desired circuit pattern is formed on at least one surface of a base member, and a spacer pattern is provided in a blank area where the circuit pattern is formed so as to be flush with the circuit pattern. circuit board.